feat: Add initial Firefox container tab extension with popup UI, background script, manifest, and a comprehensive set of icons.

manifest.json

@@ -0,0 +1,41 @@
+{
+  "manifest_version": 2,
+  "name": "Container Bookmarks",
+  "version": "1.0.0",
+  "description": "Associate bookmarks with Firefox containers. Open bookmarks in your preferred container automatically.",
+  "author": "masterElmar",
+  "icons": {
+    "48": "icons/icon-48.png",
+    "96": "icons/icon-96.png"
+  },
+  "permissions": [
+    "bookmarks",
+    "contextualIdentities",
+    "cookies",
+    "storage",
+    "tabs",
+    "menus",
+    "notifications",
+    "webNavigation"
+  ],
+  "background": {
+    "scripts": [
+      "background.js"
+    ],
+    "persistent": false
+  },
+  "browser_action": {
+    "default_icon": {
+      "48": "icons/icon-48.png",
+      "96": "icons/icon-96.png"
+    },
+    "default_title": "Container Bookmarks",
+    "default_popup": "popup/popup.html"
+  },
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "container-bookmarks@masterelmar",
+      "strict_min_version": "57.0"
+    }
+  }
+}